Improvement in bottle-stoppers



UNITED STATES PATENT OFFICE.

HENRY c. PRATT, on BoSToN, MASSACHUSETTS.

IMPROVEMENT IN BOTTLEiSTOPPERS.

Specification forming part of Letters Patent No. 104,766, dated J une 28, 1870.

I, HENRY C. PRATT, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain'Improvements in Bottle-Stopper, of which the following is a specification:

Figure l of the drawing is a side elevation of the top of a can upon which is adjusted one ofthe Stoppers which constitutes my invention. Fig. 2 is a vertical section through the center of the stopper and nozzle, showing a sectional View of the different parts when the stopper is screwed down tightly.

Like letters indicate like parts in the several figures. Y

My invention consists in applying to a tubular nozzle of a metallic can or vessel a screwstopper which is constructed by cutting a screw-thread on the inside of a hollow cylinder or tube through its-entire length, leaving it open at both ends. I then screw a cork tightlyinto one end of this hollow cylinder, forcing it in far enough to make it secure without a metal covering at the outer end, a screwthread having been cut upon the outside of the nozzle or mouth to the can or vessel, which `screw-thread corresponds with and ts the thread of the screw on the inside of the stopper. The stopper is screwed tightly down until the end of the nozzle is firmly pressed against the base of the corks and indents upon v its elastic surface, forming a tight joint impassable by the fluid contained in the can or vessel, thus securing it against leakage, and, when the contents of the can or vessel are volatile or inflammable oils or iuids, providing lyal-safeguard against the accidents whichso l frequently occur from the imperfect connement of such uid.

l A in the drawing represents the cork or other elastic plug. lB B is the cylinder, open at both ends, into which the cork is screwed. C C is the nozzle or mouth of the can or ves- .sel, upon which is cut a screw-thread, and

over which the cylinder B B is screwed.

The screw-th read on the outside of the nozzle v may be carried down close tothe top of the can or vessel, or it may be left quite short, passing only a few turns around the nozzle, as in the drawing which accompanies this specification, provided that the metal be cut away from the outer surface of the nozzle below the screwthread sufficiently to permit the cylinder B to be screwed down without impediment until the cork has thoroughly closed the vent of the nozzle.

Some of the advantages resulting from having the cork projecting through the top of the cylinder B are, first, that there is the assured certainty of the cork being there, whereas the thin layers of cork or other materials are frequently lost out of the covered Stoppers and not missed until some waste or injury has hap. pened; second, in the event of abrasion or iinperfection in the bearing-surface of the cork, it can be withdrawn and made even by paring with a knife, and then replaced; third, the projecting portion of the cork or plug being of elastic material serves as a protecting cushion or buffer to the stopper.

In some instances I construct the stoppercasing which surrounds the cork or other elastic plug by having the screw-thread on the inside thereof on e-half right hand and onehalf left hand, with a groove or channel around the center, dividing the right and left hand screw-threads from cach other, and I insert the cork or other elastic plug through the screw-thre`ad and across the groove or channel until it touches the reversed screw-thread.

Having thus described my invention, wh at I claim, and desire to secure by Letters Patent, is-

The stopper composed of' the plug or cork A and interior screw-threaded cylinder B adapted to screw upon the tial] y as herein set forth.

HENRY C. PRATT.

neck (l, substan- Witnesses:

J oHN 0. EARL, EDwD. OHATLIN. 

